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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.9 = 4/x // - 4/x
1.9-(4/x) = 0
1.9-4*x^-1 = 0
-4*x^-1 = -1.9 // : -4
x^-1 = 0.475
-1 < 0
1/(x^1) = 0.475 // * x^1
1 = 0.475*x^1 // : 0.475
2.10526316 = x^1
x = 2.10526316
x = 2.10526316
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